Scroll compressor lower bearing

ABSTRACT

A compressor includes a shell, a compression mechanism, a motor assembly, a driveshaft, and a bearing assembly. The driveshaft is drivingly engaged with the motor assembly and the compression mechanism for rotation about an axis and extends from a first end to a second end. The bearing assembly is disposed within the shell and supports the driveshaft for rotation. The bearing assembly includes a bracket, a hub, and a bushing. The bracket is coupled to the shell and includes an aperture. The hub is disposed within the aperture and defines a bore having a radially inwardly extending lip. The bushing includes a first portion and a second portion. The second portion of the bushing includes a plurality of radially extending engagement features. The second portion of the bushing is disposed within the bore of the hub such that the engagement features engage the lip of the hub.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of U.S. patent application Ser. No.15/092,402 filed on Apr. 6, 2016 which claims the benefit of U.S.Provisional Application No. 62/145,935, filed on Apr. 10, 2015. Theentire disclosures of the above applications are incorporated herein byreference.

FIELD

The present disclosure relates to a compressor, and more particularly toa lower bearing for a scroll compressor.

BACKGROUND

This section provides background information related to the presentdisclosure and is not necessarily prior art.

Bearings and bearing assemblies are used in various types of machineryand industrial equipment, such as rotary type compressors. A scrollcompressor, for example, may include one or more bearing assemblies. Thebearing assemblies can support a driveshaft for rotation about an axis.In some configurations, the scroll compressor includes an upper bearingassembly and a lower bearing assembly. While known bearing assemblieshave proven acceptable for their intended purpose, a continuous need inthe relevant art remains. In this regard, it may be desirable to providea robust, cost-effective bearing assembly that allows for quieter andmore efficient operation of the scroll compressor or other piece ofmachinery. In this regard, in some situations it may also be desirableto provide a bearing assembly that can withstand large axial forcesproduced by the driveshaft.

SUMMARY

This section provides a general summary of the disclosure, and is not acomprehensive disclosure of its full scope or all of its features.

In one form, the present disclosure provides a compressor that mayinclude a shell, a compression mechanism, a motor assembly, adriveshaft, and a bearing assembly. The compression mechanism and themotor assembly may be disposed within the shell. The driveshaft maydrivingly engage with the motor assembly and the compression mechanismfor rotation about an axis. The driveshaft may extend from a first endto a second end, with the second end having an axially extendingpassage. The bearing assembly may be disposed within the shell and maysupport the driveshaft for rotation. The bearing assembly may include abracket, a hub, and a bushing. The bracket may be coupled to the shelland have an aperture. The hub may be disposed within the aperture andmay define a bore being a through-hole in the hub. The bore may includea radially inwardly extending lip on an end of the hub. The bushing mayhave a first portion and a second portion. The second portion of thebushing may have a plurality of radially extending engagement features.The second portion of the bushing may be disposed within the bore suchthat the engagement features engage the radially inwardly extending lipof the hub.

In some configurations, the bushing may include a radially extendingflange having an upper thrust surface and a lower thrust surfaceopposite the upper thrust surface, the upper thrust surface engaging thesecond end of the driveshaft, the lower thrust surface engaging the lipof the hub

In some configurations, the hub may extend from a first end to a secondend, the bore may extend from the first end to the second end of thehub, and the radially inwardly extending lip may be located on the firstend.

In some configurations, the bore may include a first portion defining afirst diameter and a second portion defining a second diameter that isgreater than the first diameter, and the radially inwardly extending lipmay define a third diameter that is less than the first and seconddiameters.

In some configurations, the first portion of the bushing may define afourth outer diameter that is less than the second diameter, and thesecond portion of the bushing may define a fifth outer diameter that isless than the fourth outer diameter.

In some configurations, the bushing may include a radially extendingflange and at least one channel. The radially extending flange may havean upper thrust surface and a lower thrust surface opposite the upperthrust surface. The least one channel may be in the upper thrustsurface. The channel may extend radially outwardly from an aperture inthe bushing to the first portion.

In some configurations, the plurality of radially extending engagementfeatures may define a polygonal cross section having a maximum outerdiameter that is greater than the third diameter and a minimum outerdiameter that is less than the third diameter.

In some configurations, the second end of the hub may include aplurality of apertures in fluid communication with the second portion ofthe bore and in fluid communication with the shell.

In some configurations, the bracket may include at least one laterallyextending edge having an axially extending fin.

In some configurations, the bracket may include a first laterallyextending edge and a second laterally extending edge opposite the firstlaterally extending edge. The first laterally extending edge may have afirst axially extending fin. The second laterally extending edge mayhave a second axially extending fin.

In another form, the present disclosure provides a bearing assemblyhaving a hub and a bushing. The hub may include a bore having a lip onan end thereof. The lip may extend radially inwardly from an inner wallof the bore and have a shoulder and an engagement surface. The shouldermay extend radially inwardly from the inner wall. The engagement surfacemay extend axially from the shoulder to the end of the bore. The bushingmay have a first portion and a second portion. The first portion maydefine an upper thrust surface and a lower thrust surface opposite theupper thrust surface. The lower thrust surface may engage the shoulderof the hub. The second portion of the bushing may be disposed within thebore of the hub and may include a plurality of radially outwardlyextending engagement features engaging the engagement surface of thehub.

In some configurations, each of the plurality of radially outwardlyextending engagement features may extend axially along the secondportion of the bushing.

In some configurations, each of the plurality of radially outwardlyextending engagement features may include a chamfered surface.

In some configurations, an end of the hub having the bushing may includeat least one passage in fluid communication with the second portion ofthe bore.

In some configurations, the engagement features may define a polygonalshape.

In some configurations, the compressor may include a shell having alubricant sump. The bearing assembly may be supported by the shell suchthat the bore is in fluid communication with the lubricant sump.

In some configurations, a bracket may have a radially extending plateportion having an aperture and at least one laterally extending edge.The hub may be disposed within the aperture. The at least one laterallyextending edge may have an axially extending fin.

In some configurations, the bracket may include a first laterallyextending edge and a second laterally extending edge opposite the firstlaterally extending edge. The first laterally extending edge may have afirst axially extending fin. The second laterally extending edge mayhave a second axially extending fin.

In yet another form, the present disclosure provides a bearing assemblyfor rotatably supporting a driveshaft. The bearing assembly may includea hub and a bushing. The hub may define a bore therethrough. The boremay include a radially inwardly extending lip. The bushing may have aradially extending flange and a plurality of radially extendingengagement features. The radially extending flange may include an upperthrust surface engaging an end of the driveshaft and a lower thrustsurface engaging the lip of the hub. At least a portion of the bushingmay be disposed within the bore such that the engagement features engagethe lip of the hub.

In some configurations, a bracket may include a radially extending plateportion having an aperture and at least one laterally extending edge.The hub may be disposed within the aperture, and the at least onelaterally extending edge may have an axially extending fin.

Further areas of applicability will become apparent from the descriptionprovided herein. The description and specific examples in this summaryare intended for purposes of illustration only and are not intended tolimit the scope of the present disclosure.

DRAWINGS

The drawings described herein are for illustrative purposes only ofselected embodiments and not all possible implementations, and are notintended to limit the scope of the present disclosure.

FIG. 1A is a cross-sectional view of a compressor having a lower bearingassembly according to the principles of the present disclosure.

FIG. 1B is a cross-sectional view of a portion of the lower bearingassembly of FIG. 1A according to the principles of the presentdisclosure.

FIG. 2 is an exploded view of the lower bearing assembly of FIG. 1A.

FIG. 3 is a bottom end view of the lower bearing assembly of FIG. 1A.

FIG. 4 is a perspective view of a thrust bushing of the lower bearingassembly of FIG. 1A.

FIG. 5 is a perspective view of another thrust bushing of the lowerbearing assembly of FIG. 1A.

Corresponding reference numerals indicate corresponding parts throughoutthe several views of the drawings.

DETAILED DESCRIPTION

Example embodiments will now be described more fully with reference tothe accompanying drawings. Example embodiments are provided so that thisdisclosure will be thorough, and will fully convey the scope to thosewho are skilled in the art. Numerous specific details are set forth suchas examples of specific components, devices, and methods, to provide athorough understanding of embodiments of the present disclosure. It willbe apparent to those skilled in the art that specific details need notbe employed, that example embodiments may be embodied in many differentforms and that neither should be construed to limit the scope of thedisclosure. In some example embodiments, well-known processes,well-known device structures, and well-known technologies are notdescribed in detail.

With reference to FIG. 1A, a compressor 10 is provided that may includea shell assembly 12, a motor assembly 18, a compression mechanism 20,and a bearing housing assembly 22. The shell assembly 12 may house themotor assembly 18, the bearing housing assembly 22, and the compressionmechanism 20. The shell assembly 12 may include a generally cylindricalshell 34, an end cap 36, a transversely extending partition plate 37,and a base 38. The end cap 36 may be fixed to an upper end of the shell34. The base 38 may be fixed to a lower end of shell 34 and define alubricant sump 40 for holding a lubricant (not shown). The end cap 36and partition plate 37 may define a discharge chamber 42 (i.e., adischarge-pressure region) therebetween that receives compressed workingfluid from the compression mechanism 20. The partition plate 37 mayinclude an opening 39 providing communication between the compressionmechanism 20 and the discharge chamber 42. The discharge chamber 42 maygenerally form a discharge muffler for the compressor 10. A dischargefitting (not shown) may be attached to the end cap 36 and may be influid communication with the discharge chamber 42. A suction inletfitting (not shown) may be attached to the shell 34 and may be in fluidcommunication with a suction chamber 43 (i.e., a suction-pressureregion). The partition plate 37 separates the discharge chamber 42 fromthe suction chamber 43.

The motor assembly 18 may include a motor stator 44, a rotor 46, and adriveshaft 48. The stator 44 may be press fit into the shell 34. Thedriveshaft 48 may be rotatably driven by the rotor 46 and supported bythe bearing housing assembly 22 for rotation about an axis 50. Thedriveshaft 48 may include an eccentric crank pin 52 having a flatthereon for driving engagement with the compression mechanism 20. Therotor 46 may be press fit on the driveshaft 48.

The compression mechanism 20 may be driven by the motor assembly 18 andmay generally include an orbiting scroll 56 and a non-orbiting scroll58. The orbiting scroll 56 may include an end plate 60 having a spiralvane or wrap 62 on the upper surface thereof and an annular flat thrustsurface 64 on the lower surface thereof. A cylindrical hub 66 mayproject downwardly from the thrust surface 64 and may have a drivebushing 68 disposed therein. The drive bushing 68 may include an innerbore 70 in which the crank pin 52 is drivingly disposed. The crank pin52 may drivingly engage a flat surface in a portion of the inner bore 70of the drive bushing 68 to provide a radially compliant drivingarrangement.

The non-orbiting scroll 58 may include an end plate 74 and a spiral wrap76 extending from a lower surface thereof. The spiral wraps 62, 76cooperate to form a plurality of fluid pockets 80 therebetween. Whilethe compression mechanism 20 is generally illustrated and describedherein as being a scroll compression mechanism, including the orbitingscroll 56 and the non-orbiting scroll 58, it will be appreciated thatthe compression mechanism 20 may include other rotary-type compressionmechanisms within the scope of the present disclosure.

The bearing housing assembly 22 may include a main or upper bearingassembly 84 and a lower bearing assembly 86. The main and lower bearingassemblies 84, 86 may be fixed within the shell 34. The main bearingassembly 84 may include a main bearing housing 88 and a main or upperbearing 90. The main bearing housing 88 may include an annular flatthrust bearing surface 91 that supports the compression mechanism 20thereon. In this regard, the annular flat thrust bearing surface 91 mayinterface with the thrust surface 64 on the end plate 60 of the orbitingscroll 56. The upper bearing 90 may support the driveshaft 48 forrotation therein.

With reference to FIGS. 1A-3, the lower bearing assembly 86 may includea bracket 94, a hub 96, and a bushing 100. While the lower bearingassembly 86 is generally described herein as being below the upperbearing assembly 84, it will be appreciated that the relation of thelower bearing assembly 86 relative to the upper bearing assembly 84 willdepend upon the orientation of the compressor 10. Accordingly, the lowerbearing assembly 86 may be above the upper bearing assembly 84 withinthe scope of the present disclosure.

With reference to FIGS. 2 and 3, the bracket 94 may include a radiallyextending portion 94 a, at least one axially extending portion 94 b, andat least one flange or fin portion 94 c. The radially extending portion94 a may extend from and between opposed first and second ends 101, 102.The radially extending portion 94 a may include a central aperture 103,and a pair of opposed edges 104 a, 104 b extending from and between thefirst and second ends 101, 102. The axially extending portion 94 b mayextend axially upward (relative to the view in FIG. 2) from the firstand/or second ends 101, 102 of the radially extending portion 94 a. Thebracket 94 may be mounted or otherwise fastened to the shell 34 usingvarious techniques such as welding, staking, mechanically fastening, orpress-fitting, for example. In this regard, as illustrated in FIG. 2, insome configurations the axially extending portion 94 b of the bracket 94may include one or more apertures 105 for staking the bracket 94 to theshell 34.

The fin portion 94 c of the bracket 94 may extend from at least one ofthe edges 104 a, 104 b of the radially extending portion 94 a. In thisregard, as illustrated in FIG. 2, in some configurations the bracket 94may include fin portions 94 c extending axially downward (relative tothe view in FIG. 2) from each of the opposed edges 104 a, 104 b. The finportions 94 c may extend along the edges 104, 104 b a distance X (FIG.3), and below a lower surface 107 of the radially extending portion 94 aby a depth Y (FIG. 1A). The distance X may be between forty percent andninety percent of the distance between the first and second ends 101,102 of the radially extending portion 94 a. In some configurations, thedistance X may be eighty percent of the distance between the first andsecond ends 101, 102. The depth Y may be between two percent and twentypercent of the distance X. In some configurations, the depth Y may befive percent of the distance X. Accordingly, the fin portions 94 c canincrease the axial stiffness of the bracket 94. In this regard, theratio of the distance X to the distance between the first and secondends 101, 102 of the radially extending portion 94 a, and the ratio ofthe depth Y to the distance X, can help to determine a natural frequencyof the lower bearing assembly 86. Specifically, changing the value ofthe distance X and/or the depth Y can change the natural or resonantfrequency of the lower bearing assembly 86. Accordingly, the distance Yand the depth X of the fin portion 94 c can prevent the lower bearingassembly 86 from resonating when the driveshaft 48 is rotated at variousangular velocities.

With reference to FIGS. 1A, 1B, and 2, the hub 96 may include agenerally cylindrical body 106 extending from a proximal end 108 to adistal end 110 along an axis 111. In some configurations the body 106may be formed from a die-cast aluminum. It will be appreciated, however,that the body 106 can be formed from other materials, including othermetallic materials, for example, within the scope of the presentdisclosure. In an assembled configuration, the hub 96 may be disposedwithin the aperture 103 of the bracket 94.

With reference to FIG. 1A, the body 106 may include a bore or aperture112 and a flange 114. The aperture 112 may extend through the body 106from the proximal end 108 to the distal end 110. In some configurations,the aperture 112 may include or otherwise be defined by an upper portion112 a and a lower portion 112 b. The upper portion 112 a may include orotherwise define a first diameter D1, and the lower portion 112 b mayinclude or otherwise define a second diameter D2 that is larger than thefirst diameter D1. In this regard, the aperture 112 may include anannular undercut or shoulder 118 extending radially outwardly from theupper portion 112 a to the lower portion 112 b. As will be explained inmore detail below, in an assembled configuration the shoulder 118 andthe lower portion 112 b of the aperture 112 may define a chamber 120 inthe lower bearing assembly 86. In some configurations, the shoulder 118may be tapered or inclined between the upper portion 112 a and the lowerportion 112 b. In other configurations, the shoulder 118 may extend in adirection generally perpendicular to the upper and/or lower portions 112a, 112 b.

A flange or lip 116 may extend radially inwardly within and relative tothe aperture 112. In this regard, in some configurations the lip 116 mayextend radially inwardly from the lower portion 112 b of the aperture112 proximate to the distal end 110 of the body 106. Accordingly, thelip 116 may define an axially extending peripheral or engagement surface124 and a radially inwardly extending shoulder 126. The engagementsurface 124 may define a third diameter D3 that is smaller than thefirst diameter D1 of the upper portion 112 a of the aperture 112. Withreference to FIG. 3, the lip 116 may include one or more axiallyextending passages or apertures 128 symmetrically disposed relative tothe axis 111. As illustrated, in some configurations the lip 116includes two apertures 128. The apertures 128 may define radiallyoutwardly projecting slots or recesses in the engagement surface 124 ofthe lip 116. As will be explained in more detail below, in the assembledconfiguration the apertures 128 can fluidly communicate with the sump 40and the chamber 120.

With reference to FIG. 2, the flange 114 may extend radially outwardlyfrom the body 106. In an assembled configuration the flange 114 may becoupled to the bracket 94 to secure the hub 96 relative to the bracket94. In this regard, the flange 114 may be coupled to the bracket 94using various techniques such as welding or mechanical fasteners, suchas bolts 130, for example.

With reference to FIGS. 1A, 1B, and 4, the bushing 100 may include agenerally cylindrical body 134 extending from a proximal end 136 to adistal end 138 along an axis 140. As will be explained in more detailbelow, in an assembled configuration, the bushing 100 may be securedwithin the aperture 112 of the hub 96. In some configurations thebushing 100 may be formed from hardened steel. For example, the bushing100 may be formed from a sintered powdered metal. Suitable powder metalsinclude pre-alloyed steel powders (e.g., FL-4205), hybrid low-alloysteel powders (e.g., FLN-4205), diffusion-alloyed steel powders (e.g.,FD-0405), and equivalents thereof. In certain aspects, a particularlysuitable powder metal material for the bushing 100 is a hybrid low-alloysteel such as FLN2C-4005, FLN4C-4005, FLN-4205, FLN2-3905, FLN2-4400,FLN2-4405, FLN4-4400, FLN4-4405, FLN6-4405, FLNC-4405, or ANCORSTEEL4300 (4300+0.6 gr) powder metal commercially available from HoeganaesCorp. It will be appreciated, however, that the bushing 100 can beformed from other materials, including other metallic materials, forexample, within the scope of the present disclosure. In this regard, thebushing 100 and hub 96 materials may be chosen or selected to create apreferred natural frequency for the lower bearing assembly 86.

The body 134 of the bushing 100 may include an upper or proximal portion142, a lower or distal portion 144, and an aperture 145. The proximalportion 142 may extend from the proximal end 136 of the body 134, andthe distal portion 144 may extend from the proximal portion 142 to thedistal end 138 of the body 134, such that the proximal and distalportions 142, 144 meet at a joint 146. The joint 146 may include anarcuate or concave shape. The aperture 145 may extend axially from andbetween the proximal and distal ends 136, 138.

The proximal portion 142 of the body 134 may include a fourth width ordiameter D4 (FIG. 1B) that is less than the first diameter D1 of theaperture 112 and greater than the third diameter D3 of the lip 116. Thedistal portion 144 of the body 134 may include a fifth width or diameterD5 (FIG. 3) that is less than the third diameter D3 of the lip 116 andthe fourth diameter D4 of the proximal portion 142. In this regard, theproximal portion 142 may include or otherwise define a radiallyextending flange that is monolithically formed with the body 134.Accordingly, the proximal portion 142 may include an upper thrustsurface 150 and a lower thrust surface 152 opposite the upper thrustsurface 150. The upper thrust surface 150 may include one or morechannels 154. As illustrated, in some configurations the upper thrustsurface 150 includes two channels 154 symmetrically disposed about theaxis 140 of the bushing 100. It will be appreciated, however, that theupper thrust surface 150 may include more than two channels 154 withinthe scope of the present disclosure. The channels 154 may extendradially outwardly from the aperture 145 to a peripheral surface 156 ofthe proximal portion 142. As will be explained in more detail below, inthe assembled configuration, the upper thrust surface 150 of theproximal portion 142 may engage a distal end 155 of the driveshaft 48,and the lower thrust surface 152 may engage the shoulder 126 of the hub96. Accordingly, the channels 154 may be in fluid communication with thechamber 120 and an axially extending bore 157 formed in the driveshaft48.

With reference to FIG. 4, the distal portion 144 of the body 134 mayfurther include one or more ribs or engagement features 158. Theengagement features 158 may include a tapered or chamfered end 159proximate to the distal end 138 of the bushing 100. The engagementfeatures 158 may extend radially outwardly from the distal portion 144of the bushing 100. The engagement features 158 may extend axially fromthe lower thrust surface 152 toward the distal end 138 of the bushing100. As illustrated in FIG. 1B, the engagement features 158 may definean outer diameter D6. The diameter D6 may be less than the diameter D4of the proximal portion 142 of the bushing 100, and greater than thediameters D3 of the lip 116 of the hub 96 and greater than the diameterD5 of the distal portion 144 of the bushing 100. Accordingly, in theassembled configuration the engagement features 158 may engage theengagement surface 124 of the hub 96 in a press-fit arrangement. As willbe explained in more detail below, the press-fit arrangement of thebushing 100 relative to the hub 96 can act as a monolithic or unitaryconstruct and allow the lower bearing assembly 86 to have a linearnatural frequency.

With reference to FIG. 5, another bushing 200 is shown. The structureand function of the bushing 200 may be substantially similar to that ofthe bushing 100, apart from any exceptions described below and/or shownin the Figures. Therefore, the structure and/or function of similarfeatures will not be described again in detail, and like referencenumerals may be used to describe like features and components.

As illustrated, the bushing 200 may include a body 234 having a distalportion 244. The distal portion 244 may include or otherwise define apolygonal shape or configuration (e.g., triangle, square, pentagon,hexagon, etc.) having one or more engagement features 258. In theassembled configuration the engagement features 258 may engage theengagement surface 124 of the hub 96 in a press-fit arrangement.

During assembly of the compressor 10, the configuration of the diametersD1-D6, discussed above, allows a user to assemble the bushing 100, 200relative to the hub 96 by inserting the bushing 100, 200 in an axialdirection within the aperture 112 of the hub 96. The press-fitconfiguration of the engagement features 158, 258 with the engagementsurface 124 of the hub 96 secures the bushing 100, 200 within theaperture 112. The monolithic construction of the proximal and distalportions 142, 144 of the body 134, the engagement of the driveshaft 48with the upper thrust surface 150 of the proximal portion 142, and theconfiguration of the diameters D1-D6 can also improve the strength(e.g., shear strength) of the bushing 100, 200.

During operation of the compressor 10, the fin portions 94 c of thebracket 94, the material forming the hub 96, the material forming thebushing 100, 200, and/or the monolithic construction of the proximal anddistal portions 142, 144 of the body 134, 234 can allow the lowerbearing assembly 86 to have a predetermined natural frequency. In thisregard, the bearing assembly 86 can be manufactured to have a naturalfrequency that eliminates or otherwise reduces resonance as thedriveshaft 48 rotates at various angular velocities within the lowerbearing assembly 86.

The foregoing description of the embodiments has been provided forpurposes of illustration and description. It is not intended to beexhaustive or to limit the disclosure. Individual elements or featuresof a particular embodiment are generally not limited to that particularembodiment, but, where applicable, are interchangeable and can be usedin a selected embodiment, even if not specifically shown or described.The same may also be varied in many ways. Such variations are not to beregarded as a departure from the disclosure, and all such modificationsare intended to be included within the scope of the disclosure.

The terminology used herein is for the purpose of describing particularexample embodiments only and is not intended to be limiting. As usedherein, the singular forms “a,” “an,” and “the” may be intended toinclude the plural forms as well, unless the context clearly indicatesotherwise. The terms “comprises,” “comprising,” “including,” and“having,” are inclusive and therefore specify the presence of statedfeatures, integers, steps, operations, elements, and/or components, butdo not preclude the presence or addition of one or more other features,integers, steps, operations, elements, components, and/or groupsthereof. The method steps, processes, and operations described hereinare not to be construed as necessarily requiring their performance inthe particular order discussed or illustrated, unless specificallyidentified as an order of performance. It is also to be understood thatadditional or alternative steps may be employed.

When an element or layer is referred to as being “on,” “engaged to,”“connected to,” or “coupled to” another element or layer, it may bedirectly on, engaged, connected or coupled to the other element orlayer, or intervening elements or layers may be present. In contrast,when an element is referred to as being “directly on,” “directly engagedto,” “directly connected to,” or “directly coupled to” another elementor layer, there may be no intervening elements or layers present. Otherwords used to describe the relationship between elements should beinterpreted in a like fashion (e.g., “between” versus “directlybetween,” “adjacent” versus “directly adjacent,” etc.). As used herein,the term “and/or” includes any and all combinations of one or more ofthe associated listed items.

Although the terms first, second, third, etc. may be used herein todescribe various elements, components, regions, layers and/or sections,these elements, components, regions, layers and/or sections should notbe limited by these terms. These terms may be only used to distinguishone element, component, region, layer or section from another region,layer or section. Terms such as “first,” “second,” and other numericalterms when used herein do not imply a sequence or order unless clearlyindicated by the context. Thus, a first element, component, region,layer or section discussed below could be termed a second element,component, region, layer or section without departing from the teachingsof the example embodiments.

Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,”“lower,” “above,” “upper,” and the like, may be used herein for ease ofdescription to describe one element or feature's relationship to anotherelement(s) or feature(s) as illustrated in the figures. Spatiallyrelative terms may be intended to encompass different orientations ofthe device in use or operation in addition to the orientation depictedin the figures. For example, if the device in the figures is turnedover, elements described as “below” or “beneath” other elements orfeatures would then be oriented “above” the other elements or features.Thus, the example term “below” can encompass both an orientation ofabove and below. The device may be otherwise oriented (rotated 90degrees or at other orientations) and the spatially relative descriptorsused herein interpreted accordingly.

What is claimed is:
 1. A compressor comprising: a shell; a fluidcompressor disposed within the shell; a motor disposed within the shell;a driveshaft drivingly engaged with the motor and the fluid compressorfor rotation about an axis, the driveshaft extending from a first end toa second end, the second end having an axially extending passage; abearing assembly disposed within the shell and supporting the driveshaftfor rotation, the bearing assembly including a bracket coupled to theshell and having an aperture; a hub disposed within the aperture anddefining a bore being a through-hole in the hub, the bore including aradially inwardly extending lip on an end of the hub; and a bushinghaving a first portion and a second portion, the second portion of thebushing having a plurality of radially extending engagement features,the second portion of the bushing disposed within the bore such that theengagement features engage the radially inwardly extending lip of thehub.
 2. The compressor of claim 1, wherein the bushing includes aradially extending flange having an upper thrust surface and a lowerthrust surface opposite the upper thrust surface, the upper thrustsurface engaging the second end of the driveshaft, the lower thrustsurface engaging the lip of the hub.
 3. The compressor of claim 1,wherein the hub extends from a first end to a second end, the boreextends from the first end to the second end of the hub, and theradially inwardly extending lip is located on the first end.
 4. Thecompressor of claim 3, wherein the bore includes a first portiondefining a first diameter and a second portion defining a seconddiameter that is greater than the first diameter, and the radiallyinwardly extending lip defines a third diameter that is less than thefirst and second diameters.
 5. The compressor of claim 4, wherein thefirst portion of the bushing defines a fourth outer diameter that isless than the second diameter, and the second portion of the bushingdefines a fifth outer diameter that is less than the fourth outerdiameter.
 6. The compressor of claim 5, wherein the bushing includes: aradially extending flange having an upper thrust surface and a lowerthrust surface opposite the upper thrust surface, and at least onechannel in the upper thrust surface, wherein the channel extendsradially outwardly from an aperture in the bushing to the first portion.7. The compressor of claim 4, wherein the plurality of radiallyextending engagement features define polygonal cross section having amaximum outer diameter that is greater than the third diameter, and aminimum outer diameter that is less than the third diameter.
 8. Thecompressor of claim 1, wherein the second end of the hub includes aplurality of apertures in fluid communication with the second portion ofthe bore and in fluid communication with the shell.
 9. The compressor ofclaim 1, wherein the bracket includes at least one laterally extendingedge having an axially extending fin.
 10. The compressor of claim 1,wherein the bracket includes a first laterally extending edge and asecond laterally extending edge opposite the first laterally extendingedge, the first laterally extending edge having a first axiallyextending fin, the second laterally extending edge having a secondaxially extending fin.
 11. A bearing assembly comprising: a hubincluding a bore, the bore having a lip on an end thereof, the lipextending radially inwardly from an inner wall of the bore and having ashoulder and an engagement surface, the shoulder extending radiallyinwardly from the inner wall, the engagement surface extending axiallyfrom the shoulder to the end of the bore; and a bushing having a firstportion and a second portion, the first portion of the bushing definingan upper thrust surface and a lower thrust surface opposite the upperthrust surface, the lower thrust surface engaging the shoulder of thehub, the second portion of the bushing disposed within the bore of thehub and including a plurality of radially outwardly extending engagementfeatures engaging the engagement surface of the hub.
 12. The bearingassembly of claim 11, wherein each of the plurality of radiallyoutwardly extending engagement features extends axially along the secondportion of the bushing.
 13. The bearing assembly of claim 12, whereineach of the plurality of radially outwardly extending engagementfeatures includes a chamfered surface.
 14. The bearing assembly of claim11, wherein an end of the hub having the bushing includes at least onepassage in fluid communication with the second portion of the bore. 15.The bearing assembly of claim 11, wherein the engagement features definea polygonal shape.
 16. A compressor comprising the bearing assembly ofclaim 11, wherein the compressor including a shell having a lubricantsump, wherein the bearing assembly is supported by the shell such thatthe bore is in fluid communication with the lubricant sump.
 17. Thebearing assembly of claim 11, further comprising a bracket having aradially extending plate portion having an aperture and at least onelaterally extending edge, the hub disposed within the aperture, the atleast one laterally extending edge having an axially extending fin. 18.The bearing assembly of claim 17, wherein the bracket includes a firstlaterally extending edge and a second laterally extending edge oppositethe first laterally extending edge, the first laterally extending edgehaving a first axially extending fin, the second laterally extendingedge having a second axially extending fin.
 19. A bearing assembly forrotatably supporting a driveshaft, the bearing assembly comprising: ahub defining a bore extending therethrough, the bore including aradially inwardly extending lip; and a bushing having a radiallyextending flange and a plurality of radially extending engagementfeatures, the radially extending flange including an upper thrustsurface engaging an end of the driveshaft and a lower thrust surfaceengaging the lip of the hub, at least a portion of the bushing disposedwithin the bore such that the engagement features engage the lip of thehub.
 20. The bearing assembly of claim 19, further comprising a bracketincluding a radially extending plate portion having an aperture and atleast one laterally extending edge, the hub disposed within theaperture, the at least one laterally extending edge having an axiallyextending fin.